package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

import static jdk.nashorn.internal.runtime.regexp.joni.Config.log;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;


    /*
    * 添加到购物车
    * */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);
        //给当前购物车设置车主
        Long id = BaseContext.getCurrentId();
        shoppingCart.setUserId(id);
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        //找到当前用户的购物车
        queryWrapper.eq(ShoppingCart::getUserId,id);
        //判断当前是不是菜品
        if (dishId!=null){
            //当前是菜品
            //
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //当前是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //判断当前菜品是不是第一次进入购物车
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        //如果等于null,就代表上面条件查询没有找到和该数据相同的
        if (cartServiceOne!=null){
            //查到数据,在原来的基础上+1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //不存在,添加到购物车
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }
    /*
     * 减一操作
     * */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        if (dishId!=null){
            //菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart one = shoppingCartService.getOne(queryWrapper);
        if (one.getNumber()==1){
            one.setNumber(0);
            shoppingCartService.remove(queryWrapper);
        }else {
            one.setNumber(one.getNumber()-1);
            shoppingCartService.updateById(one);
        }
        return R.success(one);


    }

    /*
    * 查看购物车
    * */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车..");
        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    @DeleteMapping("/clean")
    public R<String> clean(){
        //SQL:delete from shopping_cart where user_id = ?
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");
    }
}
